Inner tube.



A. 8 SHAW.

ENNERTUBE.

AIPLICA'HUN ILED mucz, 19x5.

Patented Oct. 9, 1917.

I s PATENT OFFICE.

Ki-in. smwr, or MEDFORD, unsssonnsnrrs, sssmnon T0 sins? Tum oom nm. it i i commun on or ussssono'se'rrs. 7

essens;

To all'whom it may31bmem: 1 4 Be it known thgt'l, A; B. S nMnacitiz dent of Medford, inthe county. of Middlesex and State of Massachusetts, have in vented certain new and useful Improvements in Inner Tubes, of which the following is a specification.

This invention relates to inner tubes [or tires nnd bus for its object the production of :rtuhe which will retain air under pressure eren nftcr said tube has been nincturc do The invention consists of u to molded with u plurality of inwardly extending cupshztped nicmbeis .which are substuntiell fixed when said tube is deflated but whici are adapted to be forced outwardly against the inner face of the shoe when the tube is inflated thereby causing the inntcrinl of said tube to be compressed sidewiso in every direction.

The invention furtherconsists of certain norelgfestures oi construction nnd arrang l ment of pin-ts which willbe fully underst o by reference to the desoription of th drowingsundto he claims hereinafter iven.

For tlie purpose oi illustriiting te invention, one preferred form thereof is illustrated in thedrawings, this form having been found to ivo satisfactory and reliable results,'ulthoug li it is who understood that the various instrumentslities of which the invention consists can be variously nrrnnged uncl organized md that the invention is "not limited tozthe precise nrrnngeincnt and organization of these instrumentslities es herein shown and. described. Of the drawings Figure 1 represents in elevation of an inner tube of mu construction.

Fig; 2 represents it .trnnsverse section through a" tire end-showing 1 across section 1 of aL; -,tub,efernbodyinglhe princi ice of the resent invention said tube be ng shown p i i it is obvious that the tube will nssume",th s

condition when the air contained theiein has received its first compression. \"tl'henthe tube 10 hiisnssumccl the condition shovi n I Fig.3 represents usnmhtr VIOW'WItiX the inner tube inflated.

Fig. 4 repmsentsv an elevntion ofn cr- -tionof the tube, showing the manner 0 1nthe some on Bpeclflimtlonioi Letters Patent.

tel-section of the inwardly projecting .eup-.

1 i .7 I Similar characters desigmrtev like arts in s. v

in the drawings 10 reprosentsan inner tube of usuul construction. In carrying out the present invention this tube, is molded wi'th a plurality of in weirdly .extendingcup shaped members 11 formed therein, these cup-shaped members being substantially fixed when the inner tube is deflated. Preferably the cup-shaped members 11 are so onstructed that they intersect each other on the lines 12 and the material on these lines is slightly concuved, as indicated at 13 in Figs. '2 and 5 of the druu'in 5.

Between the rnncnvi'ties i orm'ed in the outer surface of the tube 10 are a plurality of hen-ring surfaces M which are adapted to bear against the inner face of the shoe 15 when tl'ictuhc 10 is inserted therein. The tubes 10 with the inwardly extending cupshaped members formed therein are constructed to fit the shoes 15 with the benrin r surfaces 14 in contract with theinner Wnl thereof, as shown in Fig. 2 of the drawings.

Thqcurrnture of each cop-shaped member is greater than the curvature thnt said cupshaped member \rould'essnmc when the inner tube was inflated end the outer will of each cup-shaped member pressed into contact with the inner wall of the 5119015, as shown in Fig. 3 of the drawings.

It is obvious thnl whentlie t-uhe 1'0 with the inwardly extending cup'shnped n iembcrs formed therein has been inserted. into the shoe 15 and the tube inflated, the pressure I of the'air within said tube will inrci-he ma .ti on.

dition shown in Fig. 2! at the drm rings', nn(l Fig'. 3 of the dr'nwin further compressed on the entire inner wall of said tube is subjected to-the necessary,

pressure required to retain ihetire inflated and supgortthe weight thnt must horn mined thereby. A I In case a nail orfiothermernbermuses a.

the-materiel will be compressed SIdBWlEO'lll erery direcp te ted o r. 9, 1917,- A'pinmnon ineja June; 1916. SerinINo. more v. v throughout the sexernl figures of the raw- 0f;theUn1t/ed Stateso Amemcmqnd unrest i i t t a V A. When inflated. thetube assnniesthe. eonno puncture through the shoe 15 and through the inner tube 10, the pressure of the compressed air within the tube 10 will cause the material forming the tube to rip upon the surface of the puncturing mem er and ordinarily retain it in position.

Should, however, the puncturing member become dislodged, the pressure of the compressed air within the tube 10 will cause the walls of the puncture to immediately come into contact with each other and thereby prevent any leakage of the air within the tube 10.

It is self-evident that, when the tube has been inflated, the material of said tube will have become compressed sidewise in every direction and the tendency of said material would be to expand, so that if any ordinary sized opening is made through the walls of the tube, the expansion of the material will immediately close the same.

This makes a very efl'ective inner tube for tires of motor cars, inasmuch as any unctures which may be created therein will be self-closing, and the tire trouble now so common will bereduced to a minimum.

It is believed that the many advantages of 'thls invention will be fully understood from rality of inwardly extending cup-shaped members intersecting each other and forming narrow dividing ridges the outer edges of which are hexagonal in outline.

Signed by me at 4 Post Oflice Sq., Boston, Mass, this 19th day of May, 1916.

AI B. SHAW. 

